Have you considered trying these? :
Bell and Howell Alarm Wireless Alarm System
If you mount it to the top of the door, and the child opens the door, it will break the magnet and sound a VERY loud alarm!
It would at least wake you up if the door opened either way... someone trying to get out or someone trying to get in!
Bell and Howell Alarm Wireless Alarm System
If you mount it to the top of the door, and the child opens the door, it will break the magnet and sound a VERY loud alarm!
It would at least wake you up if the door opened either way... someone trying to get out or someone trying to get in!